Automatic pump for tires.



No. 674,722. Patented May 2|, l90l.

A. c. & L. s. ANDERSEN.

AUTOMATIC PUMP FUR TIRES.

(Application filed Oct. 12, 1900.] (No Model.) 3 Sheets-Sheet I.

/N VEN 7 0633,

ATTDlF/VEYS WI T #5881? S @2 4 ado Tm: noams was: cu, FNOTO-LITNOH wuummou. n. r.

A. I m? DERSE v 2|, l90l.

MATIC PUMP FOR TIRES. Q

(No Mod {Apphcation filed Oct. 12 1900) 3 Sheets$heet 2 A ITOPN vs No. 674,722. Patented May 2|, l90l. A. c. a S.'ANDERSEN.

AUTOMATIC PUMP FOR TIRES.

(Application filed Oct. 12, 1900.;

No Model.) 3 Sheets-Sheet 3. q

WI NESSES.

A HORNE Y3 n4: ubams Pcrzns co moruuma. wasumawu. n. c,

UNITED STATES AT-ENT 0 FFICE.

ANDERS CHRISTIAN ANDERSEN AND LAURITS SOPHUS ANDERSEN, OF ODENSE, DENMARK.

AUTOMATIC PUMP. FOR TIRES.

SPECIFICATION forming part of Letters Patent No. 674,722, dated May 21, 1901.

Application filed October 12, 1900. $erial No. 32,811. (No model.) \i

To all whom it may concern:

Be it known that we, ANDERS CHRISTIAN ANDERSEN and LAURITS SoPHUs ANDERSEN, saddlers, of 1 St. Jorgens Forstad, Odense, Island of Funen, in the Kingdom of Denmark, have invented certain new and useful Improvementsin Automatic Pumps for Tires, of which the following is a specification.

The present invention refers to a method of automatically producing a constant air-pressure in pneumatic tires and an apparatus for carrying out this method. The said method consists in forcing, by means of an air-pump, which in well-known manner is worked from the bicycle-wheels, air into the tire until a suitable pressure is obtained, whereupon the pumping when this pressure has been reached automatically ceases again to commence when the pressure in the tire, owing to one reason or another, falls down below the desired pressure. The pumping is effected by means of an air-pump driven by the cyclewheel, but which may be of any kindfor instance, ofthe known kind shown on he drawings The invention is shown in the accompanying drawings, in which- Figure 1 shows part of a cycle-wheel supplied with the said arrangement. Fig. 2 shows part of the arrangement seen in side elevation and partly in section. Fig. 3 shows part of the arrangement seen from above. Fig. 4 shows the same part in side elevation, but in another position than the one shown in Fig. 2. Figs. 5, 6, and 7 are details. Figs. 2, 3, and 4 are shown on a larger scale than Fig. 1.

a is the hub; b, the fork-arms c, the spokes, and d the rim, which in known manner is supplied with a pneumatic tire of any kind. A cylinder f, in which a piston h, with pistonrod g, may move forward and backward, is by means of bands 6 or in some other suitable manner fastened to the hub a. The piston is pressed outward by a spring '5, placed inside the cylinder between the bottom of same and the piston. The cylinder-mantle is provided with a hole 70, so placed that it is between the piston and the bottom of the cylinder when the piston is in its outermost position. The outer air may thus pass into the cylinder below the piston every time this assumes the said position. The extremity of the piston-rod g is resting against a plate I, fixed rigidly upon the cyle-frame and of the shape shown in Figs. 1, 5, 6, and 7. Fig. 5 shows the plate Z seen from the inside, Fig. 6 a section on the line A B, and Figs. 5 and 7 a section on the line C D of Fig. 5. As will be seen from the figures, the plate Z is undiflated, and the distance from the summit of the undulation to the bottom is equal to the stroke of the piston h. The plate Z is attached to the inner side of the fork b, and the piston-rod g, which protrudes between the spokes 0, will consequently while the wheel is turning and actuated by the spring 1' follow the undulated surface of the plate Z, and thus obtain a forWard-and-backward movement.

In order to diminish the friction against the plate Z, the piston-rod g may have a roller m, which runs upon the plate. 1

The bottom of the cylinder is provided with a tube a, leading to the pneumatic tire d, which tube is supplied with a counter-valve 0, that prevents the air introduced into the pneumatic tire from returning through the tube n when the piston It moves outward. The air-pump is further provided with a device that automatically interrupts the pumping when the pressure in the tire d has reached a certain suitable height and which again antomatically starts the pump when the pressure in the tire falls down below the normal state. A form of construction for such an arrangementis shown in the drawings. From the tube n branches off another tube 19, leading to a cylinder q, 'Fig. 2, in which is a piston 7', that by a spring .9, inserted between a flange t and the piston 1', is forced down toward the mouth of the tube 19.

On the cylinder f is fixed a double-armed lever '11 w, that may turn around a pin a: and whose one arm '0 is bent toward the axle of the cylinder f and is provided with a hook y, that may engage into a hole 2 in the pistonrod g and with a bracket 1, having a roller 2, that may be actuated by a plate 3, fixed upon the foremost end of the piston-rod of the piston '1" when this piston is moving toward the cylinderf. The lever w is provided with a roller 4, rolling upon a spring 5, fixed upon the hub a. The turning of the lever '11 w is limited partly by a fixed lug 6 and partly by the hook y, reaching the bottom of the hole 2. The spring 5 is thus so fiX'ed that its plane is at right angles with the middle position of the arm to, (the line 7,) and when the arm to has passed this line in the one or the other direction the spring 5 will cause a further quicker turning of the lever ow, and thereby either bring the hook y to enter the hole z when this is just outside the hook or bring the arm to to bear against the lug 6, in which latter position the hook y is a certain distance away from the piston-rod g.

On the plate 3 is a spring-trigger 8, whose hook 9 is turned toward the arm wand which when the hook y is in the bottom of the hole 2 bears against a lug 10 upon the side of the arm 1), Fig. 4.

The apparatus acts in the following manner: When the cycle-wheel is turning, the piston h of the cylinder fwill, as above described, be moved forward and backward, whereby airis pumped into the tire d. Grad ually as the pressure in the tire increases the piston rof the tube g, which by means of the tube p is in connection with the tire d, moves toward the flange if, the spring 8 being compressed, and the plate 3 on the piston-rod u will therefore be pressed up against the roller 2 and turn the arm a), so that the hook y is brought over against the piston-rod g, the spring 5 being simultaneously pressed downward, and consequently tightened by the arm 10. When this arm passes the line 7, the plate 3 assumes the position shown in Fig. 4, and by a further movement of the plate 3 the spring 5 will make the hook 1 strike against the piston-rod g, it being pressed in against same by the action of the spring 5. When the hole 2 during the movement of the piston-rod g passes in front of the hook y, this hook will catch into the hole z. The pistonrod is now locked, and the pumping will cease. The hole 2 is placed thus so that itis just in front of the hook y when the piston h assumes its innermost position in the cylinder f, and the plate Z will therefore when the piston-rod is locked by the hook y not be able to act upon the piston-rod. The spring 2' will in this case remain compressed. When the lever v w assumes the position shown in Figs. 1 and 2, the spring-trigger 8 will not touch the lug 10; but this one will as the hook y jumps into the hole ,2 during the turning of the arm '0 be turned up behind the hook 9, and the length of the spring-trigger 8 is thus so adjusted that the lug 10 does not touch the hook 9 before the point of the i If y out of the hole 2, while the lug 10 during the turning of the arm 1; at the same time glides away from the hook of the spring-trigger. hen the arm to has passed the line 7, the spring 5 will force it over toward the lug 6, and there being nothing to prevent the turning of the lever 11 10 this one will turn quickly until the arm to strikes against the log 6. As soon as the hook y is disengaged from the hole .2: the piston-rod g is released. The pumping will then again commence and be continued until the piston-rod, when the desired pressure in the tire has again been reached, is stopped by the hook 'y.

In order to be able to vary the pressure in the tirefor instance, to suit the weights of different riders-the piston-rod u is provided with an axial boring, in which a rod 12, fixed upon the plate 3, may slide and be held in different positions by means of a set-screw 13. The screw 13 may during the adjusting of the rod a slide in a groove 14 in the tube q. The rod 12 is prevented from turning in the boxing of the rod uby means of a pin 15, that slides in a notch 16 in the rod 12. The rod 12 is provided with a scale corresponding to the weight of the riders. On the rod "u. there must be a suitable adj ustment-maik-for instance, the extreme edge of the rod *u.--which mark may continually be observed either directly or through the slit 14. In Fig. 2 the apparatus is adjusted at the mark 5. It will be seen that the farther the rod 12 is pushed into the rod on the more the spring 8 will have to be compressed and the greater will consequently the pressure be in the tire before the piston has moved far enough forward for the plate 3 to actuate the arm 1).

That part of the tube g which is nearest to the cylinder f and which in the figures is shown cut away may in order to prevent dirt and the like from entering the mechanism be covered by an easily-removable guard.

It must be remarked that in order to diminish the dead-space of the cylinder f the spring may be placed between the piston and the cover of the cylinder, the spring being then compressed when the piston moves inward. For the same reason the tube n may start from the very bottom of the cylinder and the counter valve 0 be placed close to this one.

Having now particularly described and ascertained the nature of this said invention and in what manner the same is to be performed, we declare that what we claim is 1. In combination,the wheel-h ub Ct, a pump cylinder having its axis parallel with the axis of the hub, a piston in said cylinder, a connection between the said cylinder and the tire, a cylinderq arranged at substantially a right angle to the pump cylinder, a catchlever pivotallysupported and having one arm moving toward and from the piston-rod to engage the same, a piston in the cylinder q arranged to hear at its front end upon a portion of the catch-lever to move the same by direct IIO action, and a catch on the said piston to engage the catch-lever to retractthe same, substantially as described.

2. In combination, a piston 'r in a tube g which by another tube p isin connection with the pneumatic tire d, the said piston 0" being actuated by a spring 3, in combination with a turnable lever 12, w whose one arm n has a hook y that may catch into a hole z upon the piston-rod g, while the other arm "w is actuated by a spring 5 whose plane is at right angle with the arm w when this one is exactly between its two extreme positions, while the piston-rod u, when the spring sis compressed, 

